In pictures: Nadal, Djokovic through in Doha, Murray and Watson lose in Hopman Cup

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  Heather Watson of Great Britain plays a forehand in the women’s single match against Daria Gavrilova of Australia Green during day four of the 2016 Hopman Cup at Perth Arena on January 6, 2016 in Perth, Australia. Will Russell/Getty Images

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  Garbine Muguruza of Spain plays a backhand in her match against Varvara Lepchenko of the USA during day four of the 2016 Brisbane International at Pat Rafter Arena on January 6, 2016 in Brisbane, Australia. Chris Hyde/Getty Images

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  Rafael Nadal of Spain returns the ball to Robin Haase of the Netherlands during their Qatar Open men’s single tennis match in Doha, Qatar January 6, 2016. Naseem Zeitoon / Reuters

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  A general view of play of the men’s single match between Andy Murray of Great Britain and Nick Krygios of Australia Green during day four of the 2016 Hopman Cup at Perth Arena on January 6, 2016 in Perth, Australia. Will Russell/Getty Image)

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  Andy Murray of Great Britain serves in the men’s single match against Nick Krygios of Australia Green during day four of the 2016 Hopman Cup at Perth Arena on January 6, 2016 in Perth, Australia. (Photo by Will Russell/Getty Images

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  Australia’s Bernard Tomic in action against Radek Stepanek of the Czech Republic during their second round match of the Brisbane International Tennis Tournament in Brisbane, Australia, 06 January 2016. Dave Hunt / EPA

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  Victoria Azarenka of Belarus returns a ball during her match against Saline Bonaventure of Belgium on day 4 of the Brisbane International Tennis Tournament in Brisbane, Australia, 06 January 2016. Dave Hunt / EPA

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  A general view of play in the mixed doubles match between Heather Watson and Andy Murray of Great Britain and Daria Gavrilova and Nick Krygios of Australia Green during day four of the 2016 Hopman Cup at Perth Arena on January 6, 2016 in Perth, Australia. Will Russell/Getty Images

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  Sabine Lisicki for Germany during the women’s match between France and Germany in session 7 on day 4 of the Hopman Cup at the Perth Arena, Perth, Australia, 06 January 2016. Dave Hunt / EPA

A selection of pictures from tennis tournaments taking place around the world, including Novak Djokovic and Rafael Nadal in action at the Qatar Open and Any Murray representing Great Britain at the Hopman Cup in Perth.